90919169 has 4 divisors (see below), whose sum is σ = 99184560. Its totient is φ = 82653780.

The previous prime is 90919141. The next prime is 90919193. The reversal of 90919169 is 96191909.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 90919169 - 2⁸ = 90918913 is a prime.

It is a super-2 number, since 2×90919169² = 16532590583301122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90915169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4132679 + ... + 4132700.

It is an arithmetic number, because the mean of its divisors is an integer number (24796140).

Almost surely, 2^90919169 is an apocalyptic number.

It is an amenable number.

90919169 is a deficient number, since it is larger than the sum of its proper divisors (8265391).

90919169 is a wasteful number, since it uses less digits than its factorization.

90919169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8265390.

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 90919169 is about 9535.1543773554. The cubic root of 90919169 is about 449.6609281149.

The spelling of 90919169 in words is "ninety million, nine hundred nineteen thousand, one hundred sixty-nine".